Fact: There is no anything like money laundering but governments want to buy BTC
The fact is that that there is no anything like money laundering but governments want to buy BTC, just assume that when you buy bitcoin then you use your credit card or bank account, your money already has transferred at that time to a foreign bank account and you have bitcoin in exchange with that, similarly if you are a miner who mines bitcoin then you sell bitcoin either in your country or either to someone who lives outside, then in exchange he transfers money using a bank account to your account so how it could be possible that money laundering might exist? Governments want to keep the price of Bitcoin down in order to buy more Bitcoin by spending the less amount of so called "Fiat" currency.
I think you misunderstood the meaning of money laundering. Someone who is buying Bitcoin is not doing something illegal, unless Bitcoin is illegal in your country. And a miner who is selling his mined Bitcoin is also not doing anything wrong at all, there is nothing bad about that as long as Bitcoin is legal in your country.
But as for money laundering, it doesn’t have anything to do with these things that you have mentioned here. Money laundering means when you’re trying to conceal an illegally obtained money through international bank transfers and legit businesses. So when they say that Bitcoin can be used for money laundering, they know what they are saying. But that doesn’t mean Bitcoin is the only thing that’s used for that, a lot of means can be used in laundering money, and fiat is on top that list.